<template>
  <view>
    <!-- 搜索框 -->
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancel-button="none" focus="true"></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResult.length!==0">
      <view class="sugg-item" v-for="(item,index) in searchResult" :key="index" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="right" size="30"></uni-icons>

      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>

      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,index) in histories" :key="index"
        @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: '',
        // 搜索结果列表
        searchResult: [],
        // 搜索关键词的历史记录
        historyList: [],
      }
    },
    onLoad() {
     this.historyList=JSON.parse( uni.getStorageSync('kw')||'[]')
    }, 
    methods: {
      // 输入事件处理
      input(e) {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          this.kw = e
          this.getSearchList()
        }, 500)
      },
      async getSearchList() {
        // 先判断搜索关键词是否为空
        if (this.kw === '') {
          this.searchResult = []
          return
        }
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/qsearch', {
          query: this.kw
        })
        if (res.meta.status !== 200) return uni.$showMsg()
        this.searchResult = res.message
        
        this.saveSearchHistory()
      },
      gotoDetail(item) {
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      saveSearchHistory(){
        const set=new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList=Array.from(set)
        // 持久化存储搜索历史
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
  clean() {
    uni.showModal({
      title: '确认清除',
      content: '您确定要清除所有搜索记录吗？',
      success: (res) => {
        if (res.confirm) {
          // 用户点击了确定按钮
          this.historyList = [];
          uni.setStorageSync('kw', '[]');
          uni.showToast({
            title: '搜索记录已清除',
            icon: 'success',
            duration: 1500
          });
        } else if (res.cancel) {
          // 用户点击了取消按钮
          uni.showToast({
            title: '操作取消',
            icon: 'none',
            duration: 1500
          });
        }
      }
    })
    
  },
  gotoGoodsList(item){
    uni.navigateTo({
      url:'/subpkg/goods_list/goods_list?query='+item
    })
  }
    },
    computed:{
      histories(){
       return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
  .search-box {
    position: sticky;
    top: 0;
    z-index: 999;
  }

  .sugg-list {
    padding: 0 5px;

    .sugg-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;

      .goods-name {
        // 文本禁止换行
        white-space: nowrap;
        // 溢出部分隐藏
        overflow: hidden;
        // 文本溢出后用...代替
        text-overflow: ellipsis;
        margin-right: 3px;

      }
    }
  }

  .history-box {
    padding: 0 5px;
    .history-title {
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }

    .history-list {
      display: flex;
      flex-wrap: wrap;
    }
    .uni-tag{
      margin-top: 5px;
      margin-right: 5px;
    }
  }
</style>